33results about How to "Make up for the lack of precision" patented technology

Embodiments of the invention provide a user portrait generation method and apparatus. The method comprises the steps of obtaining online shopping behavior information of a target account; obtaining vehicle information of a vehicle associated with the target account, wherein the vehicle information includes vehicle-based operation behavior information of a user, driving state information of the vehicle and equipment information of the vehicle, and the equipment information is used for describing equipment states of all equipment on the vehicle; and based on the online shopping behavior information and the vehicle information, generating a user portrait corresponding to the target account. By combining the online shopping behavior information with the vehicle information of the vehicle, theuser portrait is generated, so that the defect of low precision of the user portrait generated only according to the online shopping behavior is effectively made up for, and the user portrait is moreaccurate and more targeted.

The invention relates to a method for manufacturing a solar cell. The method comprises the following steps of: etching a longitudinal main grating groove and a transverse grating groove on the front surface of a silicon chip by laser, making the surface reacted by adding dilute solution of NaOH to form a pile surface, washing the pile surface by adding dilute solution of HCl and dilute solution of HF in sequence, filling gaseous POCl3 at a temperature of between 850 and 920 DEG C, and performing high-temperature dispersion to form a PN junction on the front surface of the cell; filling SiH4 gas and NH3 gas, forming a surface antireflecting film by the chemical vapor deposition, pre-fabricating a nickel alloy mask plate which is provided with grating-shaped holes corresponding to grating-shaped electrode grooves of the silicon chip, making the grating-shaped holes of the mask plate and the grating-shaped electrode grooves justify, and by using printing equipment, pressing silver paste on the front surface in the grating-shaped electrode grooves on the surface of the silicon chip through the grating-shaped holes in a printing mode; and printing an aluminum layer and the silver paste on the back surface, and in a sintering furnace, sintering the aluminum layer and the silver paste at a temperature of between 850 and 950 DEG C by infrared rays to form electrodes. For the solar cell manufactured by the method, the metal is fully contacted wit the silicon chip, and the photoelectric conversion efficiency is high.

The invention discloses a method for predicting the seepage field of a nodal region of an earth and rockfill dam and determining the infiltration side of the earth and rockfill dam. The method includes establishing a nodal-region three-dimensional geological detailed model of an unfavorable geologic body and fractures; setting up three-dimensional seepage and computing a grid model on the basis of the three-dimensional geological detailed model; simulating numerical values of the seepage field of the earth and rockfill dam on the basis of the three-dimensional geological detailed model, dispersing by the finite volume method according to the determined continuity equation, the water and steam two-phase N-S equation, the water and steam two-phase mixing speed equation and mixing density equation, the set boundary conditions and the seepage parameters of the actual project, solving with the SIMPLE algorithm, realizing numerical simulation of the seepage field of the earth and rockfill dam on the basis of the three-dimensional geological detailed model and thereby predicting the seepage field of the nodal region of the earth and rockfill dam. Geological information can be accurately reflected, and the seepage field of the nodal region of the earth and rockfill dam can be accurately simulated. Meanwhile, the seepage field is utilized to determine the infiltration side of the earth and rockfill dam by the VOF (volume of fluid) method.

The invention relates to the field of photogrammetry and surveying and mapping, particularly to a digital mapping method and system based on a live-action 3D model. Digital mapping is carried out by unmanned aerial vehicle oblique photography 3D modeling and cooperation with a ground survey robot, digital mapping of the data acquisition result is more portable and flexible, at the same time high resolution live-action 3D model data can be acquired, and the sense of reality is strong. A control point coordinate acquired by the ground survey robot can effectively control the overall accuracy of the model, an acquired feature point coordinate can effectively compensate for the defect of low coordinate precision because of the influence of a barrier object on unmanned aerial vehicle aerial photography modeling. The method and system provided by the invention have greatly improved work efficiency, also can acquire vivid 3D topographic and geomorphic data at the same time, and meet the demand for diversified data results.

Embodiments of the invention provide a user portrait generation method and apparatus. The method comprises the steps of obtaining online shopping behavior information of a target account; obtaining vehicle information of a vehicle associated with the target account, wherein the vehicle information includes vehicle-based operation behavior information of a user, driving state information of the vehicle and equipment information of the vehicle, and the equipment information is used for describing equipment states of all equipment on the vehicle; and based on the online shopping behavior information and the vehicle information, generating a user portrait corresponding to the target account. By combining the online shopping behavior information with the vehicle information of the vehicle, theuser portrait is generated, so that the defect of low precision of the user portrait generated only according to the online shopping behavior is effectively made up for, and the user portrait is moreaccurate and more targeted.

The invention discloses an electrofluid shower nozzle of a spiral micro-flow channel and belongs to the field of electrofluid printing. The electrofluid shower nozzle comprises a metal probe and a first outer cylinder. The metal probe comprises a needle body, a needle point and a circular truncated cone. The needle body is a cylinder. A first external thread is arranged on the circumferential surface of the needle body. The needle point is arranged at the lower end of the needle body. The first external thread extends to the upper part of the needle point. The circular truncated cone is arranged at the upper end of the needle body and is coaxial with the needle body. The first outer cylinder comprises a first liquid storage tank and a probe installation hole. The first liquid storage tankis provided with a first infusion opening. The probe installation hole penetrates through the first liquid storage tank from top to bottom, so that a part of the first external thread is located in the first liquid storage tank. The diameter of the inner wall of the part, located below the first liquid storage tank, of the probe installation hole is equal to the large diameter of the first external thread and is matched with the first external thread to form a first spiral micro-flow channel. In the usage state, the needle point is located outside the lower end of the probe installation hole.The spiral micro-flow channel is formed by arranging threads on the outer surface of the probe and the inner wall of the outer cylinder, so that the scale of the needle point can be made smaller thanthat of the needle point of a traditional needle tube. As a result, the printing precision is improved.

The invention relates to a tracking system and a method for improving satellite pseudo range precision. The system comprises a frequency mixer, a carrier NCO, a code NCO, a C code generator, a first shift register, a switching circuit, a P code generator, a second shift register, an I branch correlator, a Q branch correlator, an integral sum reset module and a processor, wherein the integral sum reset module is respectively connected with the processor, the I branch correlator and the Q branch correlator; and through the switching circuit, switching between the C code and the P code is realized. According to the tracking system and the method for improving satellite pseudo range precision by adopting the structure, C code and P code signal tracking can be carried out at the same time, and after the C code is captured and tracked, the P code is controlled to start according to time information, and P code tracking is switched. Not only the C code capturing speed but also the high P code pseudo range precision are provided, the circuit has a simple structure, the resources are few used, and the cost and the power consumption are reduced.

The invention discloses an optimized sampling method for an acquisition device of a secondary loop of a power system. A current signal of a measuring loop and a current signal of a protecting loop are synchronously introduced through a data acquisition unit; an acquired data reduction and judgment system in the acquisition unit performs analysis and selection so as to select corresponding sampling loop signals as input data of a monitoring device. The method, as a measuring plan with low cost and high precision, is capable of completely combining output results of two mutual inductors in a mode of software switching, which eliminates interferences brought by traditional hardware circuit switching, makes up for precision shortages when existing acquisition devices sample low magnitude of current, and effectively improves the measuring precision within a full range. Furthermore, the method can be widely applicable to various devices such as a line oscillograph, a main variation oscillograph, a set oscillograph, a PMU, a power quality and transmission line parameter synchronously measuring device, and to analog quantity sampling when the two or more device functions synchronously exist in a device with multiple functions.

The invention belongs to the technical field of material processing equipment, and discloses a following type displacement self-adjusting cutting tool. The following type displacement self-adjusting cutting tool comprises an oil cylinder, a tool rest, a force applying spring, a tool bit and a buffer spring, wherein a cylinder body of the oil cylinder is fixedly arranged on the tool rest, and the output end of the cylinder body is connected with one side, away from the oil cylinder, of the bottom part of the tool bit through the force applying spring; the buffer spring is connected between the tool rest and one side, away from the oil cylinder, of the bottom part of the tool head; the deformation tendency of the buffer spring is opposite to the deformation tendency of the force applying spring. The following type displacement self-adjusting cutting tool has the advantage that the feeding reliability, accuracy and operation efficiency of the tool in a limited space are fully improved.

The invention discloses a device and a method for collecting space two-dimensional spectrum data, which mainly solve the defect that the prior unit detector type Fourier infrared spectrum radiometer and the infrared imaging spectrum radiometer are inconvenient to use or have low spectrum resolution when collecting two-dimensional space spectrum distribution data. The prior unit detector type Fourier infra-red spectrum radiometer is additionally provided with a two-dimensional scanning mechanism with automatic adjustment, and the collection of two-dimensional spectrum data is completed by controlling the rotation of a plane reflector arranged on a two-axis electric-control automatic revolving table in the two-dimensional scanning mechanism. A synchronous controller is connected with a spectrum radiometer and the two-dimensional scanning mechanism to synchronously control the scanning of the two-dimension scanning mechanism and the spectrum data collection, and finally a data cube comprising one-dimensional spectrum information of high spectrum resolution and plentiful two-dimensional space information is formed. The invention enhances the collection efficiency and the space collection precision of spectrum radiation data and can be used for infrared target spectrum imaging and target spectrum analysis.

A system for measuring the initial speed of automobile braking, which belongs to the field of automobile braking. The pressure sensor senses the real-time pressure, and then transmits the sensed real-time pressure to the amplifier. After the amplification of the amplifier, the voltage is simulated by the A / D converter. The signal is converted into a digital signal and input to the MCU. The MCU compares the input real-time pressure with the preset maximum pressure. If the input real-time pressure is greater than or equal to the maximum pressure, the timing module starts timing; if the input real-time pressure is less than the maximum pressure Pressure, the timing module stops working; and record the duration, and then input the recorded time into the calculation module; according to the calculation formula of the calculation module, it will be substituted, and the initial braking speed will be solved, and the result will be stored.